Unified Speech and Audio Coding

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Unified Speech and Audio Coding ( USAC ) is an audio data compression format and codec for both music and speech or mixed signals using very low bit rates between 12 and 64 kbit / s. It is currently under development in MPEG and is recognized as an international standard ISO / IEC 23003-3 (also known as MPEG-D Part 3) and also as an MPEG-4 audio object type in ISO / IEC 14496-3: 2009 / Amd 3 defined.

It uses linear prediction in the time domain and tools for coding the residual signal ( ACELP -like techniques) for speech signal sections and transformation coding tools ( MDCT -based techniques) for music signal sections and it can dynamically switch between the two approaches depending on the signal content. The objectives for the development include performance increases compared to HE-AACv2 and AMR-WB + as a specialized format for voice signals. Improved variants of MPEG-4 spectral band replication (SBR) and techniques for parametric audio coding from MPEG-D MPEG Surround are integrated in the USAC codec.

history

The standardization process started in October 2007 with the call for proposals at the 82nd MPEG meeting. A proposal from the Fraunhofer Institute for Integrated Circuits and the VoiceAge Corporation (see ACELP) was used as the basis for developing the standard . This proposal, the so-called "Reference Model 0 (RM0)", was agreed after a test phase at the 85th MPEG meeting in July 2008. At the 86th meeting in October, the creation of a reference encoder was proposed and agreed.

See also

  • Opus (audio format) , an alternative, low-latency codec without patent restrictions for similar applications

Web links

  • Max Neuendorf, Philippe Gournay, Markus Multrus, Jérémie Lecomte, Bruno Bessette, Ralf Geiger, Stefan Bayer, Guillaume Fuchs, Johannes Hilpert, Nikolaus Rettelbach, Frederik Nagel, Julien Robilliard, Redwan Salami, Gerald Schuller, Roch Lefebvre, Bernhard Grill: A Novel Scheme for Low Bitrate Unified Speech and Audio Coding - MPEG RM0 . Convention Paper 7713. In: Meeting of the Audio Engineering Society . No. 126 . Munich May 2009 (English, AES126_Neuendorf [PDF; 634 kB ]).
  • Max Neuendorf, Philippe Gournay, Markus Multrus, Jeremie Lecomte, Bruno Bessette, Ralf Geiger, Stefan Bayer, Guillaume Fuchs, Johannes Hilpert, Nikolaus Rettelbach, Frederik Nagel, Julien Robilliard, Redwan Salami, Gerald Schuller, Roch Lefebvre, Bernhard Grill: Unified Speech and Audio Coding Scheme for High Quality at Low Bitrates . (English, ICASSP2009_Neuendorf [PDF; 393 kB ]).

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  1. ^ Fraunhofer Institute for Integrated Circuits: Unified Speech and Audio Coding. (No longer available online.) Archived from the original on September 28, 2011 ; Retrieved July 18, 2011 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.iis.fraunhofer.de
  2. ↑ ISO / IEC DIS 23003-3 - Information technology - MPEG audio technologies - Part 3: Unified speech and audio coding. February 15, 2011, accessed July 18, 2011 .
  3. ↑ ISO / IEC 14496-3: 2009 / PDAM 3 - Transport of unified speech and audio coding (USAC). June 30, 2011, accessed July 18, 2011 .
  4. ^ MPEG: Work Plan and Time Line. (No longer available online.) Archived from the original on July 16, 2011 ; Retrieved July 18, 2011 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / mpeg.chiariglione.org
  5. ↑ Unified Speech and Audio Coder Common Encoder Reference Software. March 2011, accessed July 18, 2011 .
  6. ↑ Unified Speech and Audio Coding. (No longer available online.) In: Fraunhofer-Gesellschaft website. Fraunhofer Institute for Integrated Circuits IIS, formerly in the original ; Retrieved January 15, 2012 .  ( Page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: Toter Link / www.iis.fraunhofer.de  
  7. ↑ http://see.xidian.edu.cn/conference/mpegjpeg/workshop/PPT/Xieminjie.pdf